replace newly added OVERRIDE with override in service worker unit tests

content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc

Index: content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc
diff --git a/content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc b/content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc
index d030972453e449887eedc0f216886d2dd947a9f4..05f938d8e545f0e6d35f6e1c0ba5bf543707aaaf 100644
--- a/content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc
+++ b/content/browser/service_worker/service_worker_controllee_request_handler_unittest.cc
@@ -90,7 +90,7 @@ class ServiceWorkerTestContentBrowserClient : public TestContentBrowserClient {
   ServiceWorkerTestContentBrowserClient() {}
   virtual bool AllowServiceWorker(const GURL& scope,
                                   const GURL& first_party,
-                                  content::ResourceContext* context) OVERRIDE {
+                                  content::ResourceContext* context) override {
     return false;
   }
 };